Experts: No firm evidence of Iranian nuclear weapons

WASHINGTON — Despite President Bush's claims that Iran is pursuing nuclear weapons that could trigger "World War III," experts in and out of government say there's no conclusive evidence that Tehran has an active nuclear-weapons program.

Even his own administration appears divided about the immediacy of the threat. While Bush and Vice President Dick Cheney speak of an Iranian weapons program as a fact, Bush's point man on Iran, Undersecretary of State Nicholas Burns, has attempted to ratchet down the rhetoric.